access icon openaccess Metal particle movement and distribution characteristics under AC voltage and ball-plane electrodes

This is an open access article published by the IET and CEPRI under the Creative Commons Attribution -NonCommercial License (http://creativecommons.org/licenses/by-nc/3.0/)
Received 14/04/2018, Accepted 18/02/2019, Revised 22/11/2018, Published 21/02/2019

Metal particles, difficult to be eliminated in gas-insulated metal-enclosed switchgear (GIS), can cause GIS discharge and breakdown between electrodes, or flashover on the insulator surface. It influences the development of ultra-high voltage (UHV) projects. Therefore, the work optimised the model of metal particle movement under AC voltage, studying the metal particle movement and distribution characteristics between ball-plane electrodes through experiment and simulation. Under AC voltage, the particle jumps on a small scale on the plane surface. With the increase of voltage, the jump amplitude increases. However, the collision frequency decreases until the particle collides with the ball electrode. When the initial phase angle of power changes, the particle-moving pattern is symmetrical in the angle ranging from 0 to 180°, and from 180 to 360°. The collision frequency changes slightly with the increase of jump amplitude when the angel ranges from 0 to 120°.

Inspec keywords: electrochemical electrodes; gas insulated switchgear; discharges (electric); flashover; insulators

Other keywords: ultra-high voltage projects; insulator surface; ball-plane electrodes; plane surface; collision frequency; ball electrode; gas-insulated metal-enclosed switchgear; GIS breakdown; particle collides; GIS discharge; flashover; AC voltage; metal particle distribution characteristics; particle-moving pattern; jump amplitude

Subjects: Dielectric breakdown and discharges; Switchgear; Electrochemical conversion and storage; Power line supports, insulators and connectors

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